¹H acquisition can be performed with decoupling of another specific ¹H resonance. The final ¹H spectrum offers the conventional format but all couplings arising from this decoupled resonance has been removed. Thus, multiplets are simplified and coupling constants and patterns can be extracted.

A particular case of homodecoupling is the band-selective homodecoupling.

Easy implementation on AVANCE spectrometers.

 For more experimental details see Tutorial: Homodecoupling.

The most standard way to implement a ¹H acquisition period using homodecoupling is:

... 2 d1 d12 pl24:f2 go=2 ph31 hd:f2 ... d12 do:f2 ...

in which:

• go starts data acquisition during an acq period using the acquisition parameters previously defined in eda.
• Homodecoupling is performed at low power (pl24) from the f2 channel using the hd command. The frequency to be irradiated is set to o2.
• The number after go (=2) defines the loop to be executed. The number of times this loop is repeated is governed by the number of scans (ns).
• ph31 is the receiver phase specified at the end of pulse program and must be cycled in accordance to all pulses involved in the pulse sequence.
• Homodecoupling is stopped using the do command.